Statistically Anisotropic Tensor Modes from Inflation

Tomohiro Fujita; Ippei Obata; Takahiro Tanaka; Shuichiro Yokoyama

doi:10.1088/1475-7516/2018/07/023

Statistically Anisotropic Tensor Modes from Inflation

Cosmology and Nongalactic Astrophysics 2018-07-25 v1 General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory

Authors: Tomohiro Fujita , Ippei Obata , Takahiro Tanaka , Shuichiro Yokoyama

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Abstract

We consider the inflationary universe with a spectator scalar field coupled to a $U(1)$ gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments as $\mathcal{P}_h \propto (1-\cos^2\theta+\cos^4\theta-\cos^6\theta)$ irrespective of the model parameters.

Keywords

cosmic inflation gravitational waves axion inflation

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@article{arxiv.1801.02778,
  title  = {Statistically Anisotropic Tensor Modes from Inflation},
  author = {Tomohiro Fujita and Ippei Obata and Takahiro Tanaka and Shuichiro Yokoyama},
  journal= {arXiv preprint arXiv:1801.02778},
  year   = {2018}
}

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23 pages and 7 figures

Statistically Anisotropic Tensor Modes from Inflation

Abstract

Keywords

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